Projectile.



H. STANBRIDGB.

PROJEGTILE.

. APPLIGATION FILED 1114111.11, 1912.

Patented Nov. 5, 1912.

entran s'rlrrns retratar oracion.

HENRY STANBRIDGE, 0F SHEFFIELD. ENGLAND, ASSIGNOR TQ JOSEPH .ALBERT HILL,

OF SHEFFIELD, ENGLAND.

Patented Nov, 5, i912.

?ROJECTILE.

l ,04135422 Specification of Letter-s Patent.

Application let March 1l, 1912. Serial No. 683,000.

To all whom it may concern:

lle it known that l, lli-inni' S'iumnnrnon, a snbjectoif the King et (li-eat Britain and Ireland, and residing at 3S) Rotherham road, Tinsley, Sheffield, in the county of York, England, have invented certain new and useful Improvements in Projeetiles, of which the following is a specification.

This inventien relatesV to projectiles tor small arms and has tor one of its objects to produce a projectile which shall not be liable to expand or detox-n1 in the bore, as is usually the case with projectiles as hitherto known, owing to the shock of discharge.

A. further objectl ot the invention is to produce a projectile so shaped thatI it shall only engage the ritling on a small predetermined band or bands formed with sutlicient gripping area to rotate the projectile, such a result bei ng only secured by producing a projectile which, it compound, (that is made of lead or other heavy material and an 'outer case or cases) is prevented from expanding in the bore of the rille. In the case of projectiles constructed in accordance with my invention friction in the passage of the projectile along the barrel is almost entirely avoided as the frictional area is very small, existing only where the narrow edge ot the driving band or belt contacts with the lands and grooves in the barrel, the small cylindrical part of the projectile making contact only with the lands of the riding, whercas in the case of projectiles hitherto known and which deform on being tired the entire cylindrical part, to the extent perhaps of two-thirds of the surface areaof the projectile, makes rictional contact with the barrel which thus acts as a swaging or drawing die and causes .so-called nickel-fouling or depositing of nickel on the landsand grooves if it be present in the casing or envelopof the projectile. An additional advantage of pro-A jectiles constructed in accordance with this invention is to be found in the fact that they do not drift to the'greatextent that is eX# perienced with known projectiles.

A further object of the invention is to produce a projectile which shall, not deform or deflect on grazing impact or ricochet as is so often the case with projectiles at present in use and which are often caused to mushroom even upon impact with sand, the lead core readily leaving the envelop.

The invention consists primarily in a pro- "project ile.

jet-tile for small arms comprising an outer casing having a comparatively thick head and walls ot' gradually decreasing strength and into which a metal core is inserted, the

walls of the casing being subsequently closed in jneterably almost toa. point thereby thickening the walls and consequently strengthening the base. t

The accompanying drawings illustrate one mode of carrying ont the invention.

Figure l is a sectional elevation .showing one convenientform of outer casing for the Fig. 2 is an elevation of the complete projectile and F ig. 3 is a sectional elevation showing the completed projectile;

In carrying my invention into edect in one convenient manner l form the outer,-

casing or envelop of the projectile with a' solid head a preferably approximately one caliber thick and'with walls Z2 otgradnally decreasing strength toward the center, the rear portlons c of the walls being ably approximately parallel; Into such a casing, which may be conveniently formed from cupro-nickel, German silver or similar non-corrosive metal ofhigh tenacity, a

core or lead or other suitable heavy metal preferis inserted and the walls are closedsin or choked down upon the core asr shown in Fig. 3 thus making a very strong projectilenot liable to expand or deform inthe barrel andgnot easily deformed or deflected upon grazing impact or ricochet. The closing-in of the walls in this manner has the ell'ect of thickening them as will be' s'eei from Fig. 3, thus strengthening the base and at the sarne time preventing. pressure from being exerted on the more or lessfplastio core. In addition to the closing-in or choking down of the walls the necessary Swell for the driv ing band or belt Z is formed in the.envelop and a comparatively narrow cylindrical portion e is preferably formed upon each side of the' driving belt-or band.

lt has been found in practice that a limit to the thickening of the walls of the casing to give it the necessary strength to resist j deformation or expansion due to the shock of discharge, consistent with maintaining a high specific gravity, is very easily' reached. and is also determined by the length that can be given to the. projectile. y

I have found that for pointed componi-1d projectiles of a length of ve and six calibers a 'thickness of walls inthe parallel los portion of mie-temli or one-twelfth of al caliber is Sulicient when the buseof the projectile closed in 1n the nmuner above referred to, but it iS toY be uridersoud flint the invention is uol; to be v Confined oir liinitd to any pailicular dimensions as these will be Chosen ns may be bes g Suited lo the practical Coiidilious under1 rear or the:

which tlm invention is lo be a'iplied. The driving bell 0i' bund f? muy lic udwmlzi for small v:wins comprising :11i outer easing having :l i

TWil messes:

llif'if. li. EYANS. CYRIL VUGDCQCH. 

